5/16 Steel Exhaust Valve Guide Upgrade for Power Adder Heads CID Big Block Chevy cylinder heads STD injector location is the

STD injector location is the lower cast bungs while CNC fuel rail brackets are in stock

and is designed for classes that must retain 4150 bolt spacing

Upper Injector location has been shown in testing to make slightly more power than the lower placement

CNC chamber softening that incorporates the generic radial conical softening like most companies use

Steel Exhaust guides with K Line inserts for the power adder crowd and chamber softening

5/16 Steel Exhaust Valve Guide Upgrade for Power Adder Heads CID Big Block Chevy cylinder heads STD injector location is the5 16 Steel Exhaust Valve Guide Upgrade with a K Line Valve Guide Liner insert for Power Adder cylinder heads. Steel valve guides better withstand the higher exhaust temperatures experienced in power adder applications.